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  <title>iframe的使用</title>
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    <h1>使用iframe嵌套网页</h1>
    <a href="https://www.baidu.com/" target="tupian">点击打开百度</a><br/>
    <a href="http://www.taobao.com/" target="tupian">点击打开淘宝</a><br/>
    <a href="http://www.qq.com/" target="tupian">点击打开腾讯</a><br/>
    <a href="http://www.bdqn.com/" target="bdqn">点击打开北大青鸟</a><br/>
    <a href="6.html">点击打开一个HTML的页面</a>
    <hr />
    <iframe src="http://www.baidu.com/" width="100%" height="400" name="tupian" frameborder="0" 
     border="0" marginwidth="0" marginheight="0" scrolling="no"></iframe>
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